The uses and advantages of Integrating Sphere

Purpose of Integrating Spheres
An integrating sphere gathers electromagnetic radiation from a source that is typically external to the optical instrument. This is done for the purpose of flux measurement or optical attenuation. Radiation that is introduced into an integrating sphere lighting system hits the reflective walls and is diffusely reflected many times. The radiation is scattered highly uniformly at the spherical walls following multiple reflections. It is simple to measure the integrated radiation level. This radiation level is directly proportional to the starting radiation level.

The general-purpose spheres from LISUN are created to be economical spheres. These can be set up in a variety of ways for a wide range of applications. A single sphere test can accurately carry out a variety of integrating sphere duties. These include uniform illumination, light measurement, and reflectance measurement thanks to a wide range of accessories. LISUN’s spheres are a practical option for integrating spherical light measurement and light characterization.

Uses
The total luminous flux from lamps and light bulbs can be measured using a sphere lighting system. For these applications, integrating sphere sizes might range from a few centimeters to a few meters. Usually, the size of the light source dictates the ideal size for an integrating sphere. Larger spheres offer better homogeneity because they have a larger surface. Integrating sphere in conjunction with a spectrometer can help obtain a lot of things. These include spectral power distribution derived numbers like the color rendering index or the more recent TM-30 index, as well as colorimetric values like chromaticity and dominant wavelength.

Laser beams and other highly divergent sources can be easily captured and included into an integrating sphere. These sources include laser diodes. The signal at the detector is unaffected by a wide variety of incident angles over a sizable area.

An integrating sphere is also the best tool for measuring irradiance as a cosine corrector. The output aperture of an integrating sphere source can produce a diffuse and Lambertian light source that is almost ideal. This is when constructed properly. The light source is outside the integrating sphere in these cases, which is commonly referred to as a 2-pi measurement.

Advantages
They can measure diverging beams to over 45 degrees while other techniques cannot. They have a significantly wider dynamic range than thermal sensors. Therefore, the same device can measure down to microwatts while still being able to measure relatively high powers. Integrating spheres are capable of measuring high-size, low-power beams. Beam alignment and coherence have little effect on integrating spheres. They have a high damage threshold due to their reflecting surface. This is especially true in case of brief pulses. Power, spectrum, and temporal pulse form can all be measured simultaneously using integrating spheres. Integrating spheres can monitor high powers like heat sensors while having the quick response time of photodiodes.

Other applications
Integrating sphere is simply used to measure fibers. This is done by swapping out the front flange of the sensor for a fiber optic adapter. The first reflection spot at the source’s opposite side is not very intense since the usual optical fiber output slowly diverges. The divergent configuration or the collimated beam configuration are frequently acceptable as a result. It is advised to use the collimated beam configuration when utilizing a fiber collimator.

Transmitted radiation from a sample held at the entrance port can be collected using the IS6 integrating sphere to determine transmittance. After being exposed to radiation, the sample is compared to a direct source measurement made without it. The detector is protected from non-integrated transmission by a baffle. The sample’s proximity to the input port may have an impact on the measurement. Mount the sample farther from the entrance port if you are just interested in the narrow angle transmission.

FAQs
Does the integrating spheres’ (IC2 or IS6) ability to handle high power have a limit?
The size of the integrating sphere, the diameter of the fiber optic cable, and the spectrometer model determine the response to the saturation query (slit size, range, etc.). Typically, we advise utilizing a spectrometer with a 25um slit and the F600-VISNIR fiber optic cable with the IS6 6″ integrating sphere. Fortunately, being too bright is never really a problem because we can simply upgrade the system with attenuation filters. In this situation, it would be wise to take a closer look at the inline filter holder and install more neutral density filters with known signal attenuation. In this manner, you can dim the system’s lighting and incorporate a reduction factor into the software to obtain the desired outcomes

The damage threshold for a sphere when subjected to a laser is roughly 1.7 J/cm2, though this will also depend on the laser’s wavelength and the precise thickness of the coating used. Customers have the choice of weakening their signal before entering the sphere or selecting a special sphere option designed for stronger powers. Similarly, if you are worried that your laser might be too powerful, we advise attenuating it first before gradually boosting the system’s power.

What is measured by an integrating sphere?
In order to measure the light from individual LEDs and LED lighting products, the Ulbricht Sphere uses a spectroradiometer. By examining its photometric, colorimetric, and electrical properties, LEDs should be examined for quality. For additional information about the LPCE-2 High Precision CCD Spectroradiometer Ulbricht Sphere System, kindly click here.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Integrating Sphere, Spectroradiometer, Surge Generator, ESD Simulator Guns, EMI Receiver, EMC Test Equipment, Electrical Safety Tester, Environmental Chamber, Temperature Chamber, Climate Chamber, Thermal Chamber, Salt Spray Test, Dust Test Chamber, Waterproof Test, RoHS Test (EDXRF), Glow Wire Test and Needle Flame Test.

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Tags：LPCE-2 (LMS-9000) , LPCE-3